EP3455048B1 - Blasfolienanlage zur herstellung einer blasfolie - Google Patents

Blasfolienanlage zur herstellung einer blasfolie Download PDF

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Publication number
EP3455048B1
EP3455048B1 EP17722745.1A EP17722745A EP3455048B1 EP 3455048 B1 EP3455048 B1 EP 3455048B1 EP 17722745 A EP17722745 A EP 17722745A EP 3455048 B1 EP3455048 B1 EP 3455048B1
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EP
European Patent Office
Prior art keywords
blown film
ring
flow
film
rings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP17722745.1A
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German (de)
English (en)
French (fr)
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EP3455048A1 (de
Inventor
Martin Backmann
Markus Bussmann
Jens Goldenstein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Windmoeller and Hoelscher KG
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Windmoeller and Hoelscher KG
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Publication of EP3455048A1 publication Critical patent/EP3455048A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/254—Sealing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/885—External treatment, e.g. by using air rings for cooling tubular films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • B29C48/9125—Cooling of hollow articles of tubular films internally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • B29C48/913—Cooling of hollow articles of tubular films externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/926—Flow or feed rate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92971—Fluids, e.g. for temperature control or of environment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle

Definitions

  • the invention relates to a blown film system according to the preamble of claim 1.
  • a blown film system mentioned at the beginning is used for the efficient production of a film, with the blown film system producing a blown film.
  • At least one extruder is initially provided in the blown film system, with which at least one melt strand is produced - preferably from a raw material.
  • This is followed by at least one distribution tool for converting the at least one melt strand into a circumferential melt layer.
  • This melt layer then reaches an outlet nozzle, which is generally circular, with which the at least one melt layer can be dispensed. After exiting the outlet nozzle, the melt layer forms the blown film.
  • This blown film now gradually cools down as it can now release heat into the environment.
  • the production speed when producing a blown film depends largely on how quickly the blown film cools down.
  • a device for applying at least one fluid stream, in particular an air stream, to the blown film. to be provided in order to remove additional heat or to cool the blown film.
  • the US 4,473,527 shows a blown film system with external cooling rings, which ensure cooling of the blown film by applying air currents.
  • the JP S 58-107315 A and the JP S 58-94433 A show an external cooling ring and an extraction ring underneath. This causes the cooling air flow to be partially transported against the transport direction of the film tube.
  • the JP H 09 123273 A shows, however, an external cooling ring and a suction ring arranged above it, viewed in the transport direction.
  • the JP 2010 247453 A shows an external cooling ring and both a suction ring arranged above and below it.
  • the JP 2002 067146 A shows opposing inner and outer cooling rings inside and outside the foil bubble.
  • the EP 1 736 297 A1 shows an external cooling ring that generates a cooling air flow directed in the transport direction of the film bubble.
  • the cooling ring is divided into a plurality of flow channels whose cross section can be controlled, so that the cooling air flow that passes through a flow channel can be controlled.
  • the EP 2 801 467 A1 shows a calibration device whose calibration segments are arranged outside the film tube and whose air outlets can contribute to cooling the film.
  • the US 5,804,221 A shows a multi-stage external cooling ring in which the Venturi effect is used to suck in additional air through openings between two concentrically arranged rings, which provides an amount for cooling the film.
  • this measure also has limits, i.e. that the effectiveness of this measure cannot be increased at will.
  • the object of the present invention is therefore to propose a blown film system with which the production speed of a blown film can be further increased.
  • At least one pressure provision device is provided, with which the blown film can be brought to the device for applying a fluid flow to the blown film by means of at least one overpressure and/or one underpressure.
  • Overpressure or underpressure here means a pressure that is increased or reduced compared to the ambient pressure prevailing around the blown film system.
  • the invention is based on the knowledge that an increased exposure of the blown film to at least one fluid stream does not improve the cooling because the larger amount of fluid per unit of time cannot be completely brought to the blown film.
  • One reason is, among other things, that the blown film can retreat.
  • the blown film is held close to this device by an additional force in the direction of the device for applying at least one fluid stream to the blown film (hereinafter referred to as fluid application device), so that the fluid can be used as completely as possible to remove the heat is.
  • the cooling capacity and thus the production speed of the Blown film can be increased.
  • the blown film can be pulled towards the fluid application device. In one embodiment of the invention, this is done by a negative pressure on the side of the fluid application device. This means that the fluid flow and the negative pressure act on the same side (inside the blown film or outside the blown film) of the blown film.
  • the fluid flow causes excess pressure, but the resulting force increases as the distance decreases.
  • the negative pressure acts simultaneously, with the excess pressure resulting from the fluid flow and said negative pressure forming an equilibrium with regard to the forces acting on the blown film.
  • the pressure provision device comprises at least one ring, which comprises a plurality of modules distributed over the circumference for controlling the temperature and/or the volume flow.
  • a device providing excess pressure can be provided on the side of the wall of the blown film facing away from the fluid application, with which the blown film can be pressed against the fluid application device.
  • the fluid application device and the pressure application device can be arranged directly opposite one another.
  • a pressure balance can be adjustable, which guides the bals film close to the fluid application device or holds it there.
  • the fluid application device and the pressure provision device can be arranged within the blown film.
  • the advantage in this case is that the blown film can easily be manually pulled out of the outlet nozzle at the start of production and pulled through the subsequent devices.
  • the fluid application device and the pressure provision device can be arranged outside the blown film be.
  • the advantage here is the better accessibility of these two facilities, even during production.
  • the fluid application device can be outside the blown film and the pressure provision device can be inside Blown film can be arranged.
  • the pressure provision device is a component on or within the fluid application device, which has a shape and/or an arrangement with which a negative pressure can be generated due to the fluid stream flowing past.
  • the Bernoulli effect is used here, in which a fluid flow whose speed is increased - for example by a constriction - creates a static negative pressure.
  • this static negative pressure then serves to bring the blown film to the fluid application device.
  • this component or another component can be connected to a negative pressure source such as the suction side of a blower or a compressor. In this way, a further control option for the negative pressure is created in that the magnitude of the negative pressure can be adjusted by the blower or compressor power.
  • the Figure 1 shows a blown film system 1 for producing a blown film, which initially comprises at least one extruder 2, with which plastic, for example in granulate form, can be plasticized.
  • the plastic melt produced in this way is fed via a line 3 to a distribution tool 4, where this melt is transferred into a cylindrical melt stream, so that this melt stream can be pulled out of an outlet nozzle 5, which is not visible in this figure, in the withdrawal direction z.
  • a blown film 6 that has not yet solidified. This now enters a cool box 12 in area I, in which the blown film is guided in a cylindrical or slightly conical shape.
  • This cool box comprises at least one device for applying at least one fluid stream to the blown film and at least one pressure provision device with which the blown film 6 can be brought to the device for applying at least one fluid stream to the blown film with at least one positive pressure and / or negative pressure. Details and advantageous embodiments of this cool box are shown and explained using the following figures.
  • the blown film 6 is inflated from the inside in area II using a slight excess pressure, so that it has a larger diameter within the optional calibration device 7.
  • the film tube is solidified by at least one temperature control device 8, which is often referred to as a cooling ring because of its ring-like design surrounding the film tube.
  • This cooling ring can - as shown in the present figure - be arranged below the cool box 12. Alternatively, such a cooling ring can also be provided above the cool box 12.
  • the film tube 6 comes into the effective range of a flattening device 9, in which the mostly circular film tube is converted into an elliptical cross-section with increasing eccentricity until it finally has two film webs lying on top of each other in the area of influence of the take-off rollers, which are connected to each other on their sides are connected.
  • the flattening device is arranged rotatably, with the axis of rotation essentially aligned with the hose axis 11, which is in the Figure 1 indicated by a dash-dotted line is aligned.
  • the Figure 1 also shows a reversing device 15, which has the task of guiding the flattened film tube from the flattening device to the stationary roller 16 without causing damage.
  • the arrow 17 indicates that this film tube is now sent for further processing, which is not specified here.
  • This box initially comprises a box 101, which can be designed, for example, cubic, cuboid or cylindrical.
  • the blown film passage 102 is adapted to the shape of the film and is therefore preferably circular.
  • the upper portion of the box may include a known cooling ring 107.
  • Such a cooling ring 107 can also be placed on the box 101.
  • the box 101 further comprises at least one exhaust opening 103, through which the box can be subjected to a negative pressure. This is indicated by arrow 104.
  • the exhaust air opening 103 can be connected to a vacuum source, not shown, which can advantageously be a blower or a pump.
  • the box 101 can include side walls 105 which are divided orthogonally to the direction z, so that these parts can be moved relative to one another, the parts always having an overlap.
  • a seal can be provided in the area of the overlap. This measure ensures that the height of the box can be changed in the z direction, which is shown by the arrow 106.
  • the box 101 can preferably be moved together so that an operator can better reach the outlet nozzle 5. However, during operation, the box can remain in its position Height can be adjusted so that the edge of the box, which limits the bubble passage 102, is arranged as close as possible to the blown film 6. This is in the Figures 3 and 4 shown.
  • Rings 110 are also arranged within the cool box 12, via which the blown film 6 can be acted upon with a fluid.
  • the fluid is supplied to the rings via a common feed channel 111, which is indicated by the arrow 112.
  • the fluid is under excess pressure.
  • the function of such a ring 110 is explained below using the Figure 5 be explained.
  • the feed channel 111 can be designed as a flexible hose, a bellows or similar between the individual rings. The reason is that the distance between the rings 110 is adjustable, which is indicated by the arrows 113 in the Figure 3 is indicated.
  • the lower ring can be arranged in the area of the outlet nozzle 6 on the tool 114 and preferably fastened there, whereas the upper ring can be arranged on a wall of the box 101.
  • the individual rings can be mounted on guides, these guides running in the circumferential direction of the blown film, but are inclined in the z direction, so that a movement along the guide simultaneously leads to a movement in the z direction.
  • an arrangement of guides in direction z is possible, so that a simple displacement/movement in direction z is sufficient.
  • the rings can be connected to one another via resilient elements, so that a height adjustment of the box is sufficient to also adjust the height positions of the rings. If the spring constants of the resilient elements are the same or comparable, the rings are at the same distance from one another.
  • the rings have an increasing diameter. This allows the blown film 6 to be guided conically, ie the blown film points within the cool box 12 in the z direction increasing diameter.
  • the angle of the blown film can also be adjusted relative to the direction z (so-called opening angle ⁇ ).
  • opening angle ⁇ Two different opening angles ⁇ are in the Figures 3 and 4 shown. For example, the opening angle is: Figure 3 about 5° and in the Figure 4 approx. 3°.
  • the Figure 5 now shows the operating principle of a ring 110.
  • the fluid flow indicated by the arrow 502, enters the interior 503 through the opening 501 and is directed there in the direction of the blown film 6.
  • this includes an expanded area 504.
  • a flow divider 505 is provided, which divides the fluid flow into two - preferably equal - partial flows (see split arrow 506) and thereby redirects them, so that a first partial flow (arrow 507) is at least partially deflected in the direction z and a second partial flow (arrow 508) is at least partially deflected against the direction z.
  • the flow divider 505 and the expanded area 504 form two outlets 509 and 510, with the respective flow cross sections becoming narrower in the direction of flow.
  • This increases the flow velocities of the partial streams, with the result that a negative pressure is created at the edges of the area 511 between the flow divider 505 and the blown film 6, so that the air located there is drawn out, which is indicated by the arrows 512.
  • this results in a radially outwardly directed force 513 acting on the blown film, with which the blown film is pulled towards the ring.
  • the ring 110 and the flow divider are preferably rotationally symmetrical, so that the force acting on the blown film 6 is also rotationally symmetrical.
  • the Figure 6 now shows a further embodiment of the invention, which corresponds to the embodiment of Figures 2 to 4 resembles.
  • the box 601 now preferably has a fixed height. It is advantageous if this height also covers area II (see Figure 1 ) included.
  • the rings 110 are now arranged within the box 601, with none of the rings 110 being attached to the box 601. Above the rings 110 but inside the box 601 is the cooling ring is also arranged.
  • the Figure 6 also illustrates the prevailing pressure conditions. Inside the blown film there is an internal pressure p in which is greater than the ambient pressure p 0 .
  • the pressure prevailing in the box is smaller than the two pressures pin and p 0 .
  • a fan or a compressor is again preferably provided.
  • the rings are in turn supplied with a fluid stream via a common supply channel.
  • each ring 110 is assigned its own box 701, each box preferably also having its own suction channel 703.
  • the pressure p sys in each box 701 can be controlled separately.
  • each ring has a feed channel 711.
  • a cool box 12 designed in this way can be constructed modularly. Depending on requirements, additional boxes 701 can simply be placed on top of the top box, or boxes 701 could be removed.
  • the Figure 8 now shows an extension of the exemplary embodiment Figure 7 .
  • Sensors 830 are now provided between the rings 110 and are able to determine relevant measurement data for the blown film, such as the position, the thickness or the temperature.
  • a control system can now be set up, as already described in connection with the Figure 7 was described.
  • the data is sent to a computing device, not shown, which compares the measured data with target data and uses this to generate control signals for the rings or the fluid flow and for the target pressure within the box 701.
  • a control is provided separately for each ring, but these control signals are preferably also generated taking into account the data and signals from at least one other ring.
  • the Figure 9 shows another variant of a ring 910, which is similar to a ring 110.
  • the ring includes 110 not one flow part, but from the outset two separate channels 911 for both partial flows of the fluid flow.
  • the exit areas 912 are designed in the same way as in the example Figure 5 , i.e. here too the cross section narrows, so that the in connection with the Figure 5 effects described occur.
  • a suction port 913 is provided, the suction end 914 of which is designed similarly to the flow divider 505.
  • the suction nozzle is preferably used to further evacuate the space 915 between the blown film 6 and the suction end 914.
  • the suction port can be connected separately to a vacuum source with the pressure p ab or simply end in the box, so that the pressure p sys also acts in the space 915 via the suction port 913.
  • the exemplary embodiment of the Figure 10 comes without a box. Although the blown film is no longer pulled against the rings 110 by an additional negative pressure, an additional pressure application device is provided. Within the blown film 6, another ring 1010 is now provided, which is constructed like a ring 110 and has the same function. This ring 1010 acts like a seal, so that the interior of the blown film 6 can be divided into two pressure zones. Below the ring 1010 there is the pressure p in,1 , above the pressure p in,2 .
  • the pressure p in,1 is preferably adjustable so that it develops the same force as the pressure p sys , which was shown in connection with the previously described exemplary embodiments.
  • the further pressurization device 1011 can be constructed similarly to already known internal cooling devices, with which a blown film 6 can be cooled from the inside.
  • the advantage of the embodiment Figure 10 is that condensates that emerge as gas from the blown film and that are deposited on the rings 110 can simply be removed from the rings and the other components, for example wiped off. Such condensates are primarily paraffins.
  • the Figure 11 now discloses an embodiment in which the fluid flow of the individual rings 110 have different sizes.
  • the volume flows of the fluid in each ring are preferably different and preferably adjustable. This is symbolized by the information v 1 , v 2 , v 3 and v 4 . This means that the cooling capacity can be varied via the height of the blown film 6.
  • At least one of the rings is provided with a plurality of modules 1220 distributed over the circumference for controlling the temperature and/or the volume flow of the fluid flow.
  • the fluid flow can have different temperatures at different angular positions. This is made clear by the information T 1 , T 2 , T 3 .
  • the fluid flow can have different volume flows at different angular positions. This is made clear by the information V 1 , V 2 , V 3 .
  • a control can be provided with which the desired thickness of the blown film can be regulated at different angular positions, i.e. a profile control over the circumference of the Blown film 6.
  • FIG. 13 The embodiment of the Figure 13 is similar to that of Figure 10 , although ring 1010 has been omitted. However, the structure and advantages of the invention essentially correspond to the exemplary embodiment Figure 10 .
  • the Figure 14 now discloses an arrangement of the rings 110, with at least some of the rings 110 having an inner diameter that is smaller than the diameter of the outlet nozzle 5. A larger inflation ratio (ratio of minimum to maximum diameter) of the blown film 6 can thus be achieved.
  • the Figure 15 shows a further embodiment of the invention, in which rings 110 are used to hold a cooling liquid 1511 applied to the blown film 6 through the rings 1510 in this location.
  • the rings 110 therefore serve as seals that prevent the coolant from flowing out.
  • liquid cooling can be provided in known blown film systems, with which the cooling rate of the blown film can be increased further. If the rings 110 and 1510 are arranged in a box, for example box 101, the liquid can be sucked out via the suction channel.
  • the Figure 16 shows a similar embodiment in which a ring 1610 is constructed like a ring 110. A liquid stream is provided as a fluid stream in the ring 1610.
  • the Figure 17 shows a further development of the invention, which once again addresses the problem of condensates forming.
  • the condensate collecting on the underside of a condensate can flow up to the drip nose 1711, which is arranged on the underside of the ring 110.
  • the drip nose ensures that the condensate drips off at a designated location so that it does not get onto the blown film 6.
  • the ring 110 underneath is now advantageously equipped with a collecting tray 1710, with which the dripping condensate and also the condensate that precipitates directly can be collected.
  • the condensate can be collected in a waste container via discharge lines (not shown).
  • the Figure 18 now shows an exemplary embodiment in which an arrangement according to one or more of the previously shown and described exemplary embodiments is arranged not outside but inside the blown film 6.
  • the function and advantages of this embodiment correspond to the other embodiments.
  • the Figure 19 describes an embodiment of the rings 110, in which the fluid flow through the outlets is directed not only in the transport direction z and/or in the radial direction r of the blown film, but at least partially also in the circumferential direction of the blown film.
  • you can inside the rings Guide elements may be provided which direct the fluid flow in the desired direction. This can ensure that the fluid is better distributed over the circumference of the blown film, which leads to an improved cooling effect.
  • a cross orientation can be impressed on the blown film. This measure can lead to better stability of the blown film and the film product later produced from it.
  • the ring 110 according to the Figure 20 can be rotatably mounted, which can then be rotated relative to the outlet nozzle. Nevertheless, a relative rotatability of two rings 110 is also advantageous. This rotatability is illustrated by the arrow 2020.
  • the walls 520, 521 and/or the flow divider 505 can also be rotatable relative to one another. Relative rotation can be caused by a directed fluid flow that has a circumferential directional component. Outlets 509 and 510, which include walls with openings, are advantageous, with the openings allowing the fluid flow to be directed in the desired direction. Alternatively, a drive can be provided which ensures the rotation of the rings.
  • the rotation of the rings 110 or the components of the rings is reversible, that is, the rings can be deflected to the right and to the left by a - usually fixed - angular amount.
  • the covers 2030 shown can be used to imprint a reversing influence on the blown film. At the points where the cover interrupts the fluid flow, there is less cooling than at other points. This point remains warmer and the viscosity is greater, so that the blown film can "melt" here. These areas become thinner.
  • the reversal of the rings 20 is coordinated with the reversing device 15 so that these thin spots are always in the same positions on the flattened film, for example on its edges.
  • the film is stretched in the longitudinal direction inline or offline in so-called MDO devices.
  • MDO devices so-called MDO devices.
  • the film becomes narrower in the transverse direction and thickens at the side edges.
  • the result after thickening is preferably a film thickness that corresponds as closely as possible to that in the middle of the film. In this way, the waste caused by cutting off the side areas that have a film thickness that differs too much can be reduced.
  • FIG. 21 An embodiment is shown in which the wall 520, the wall 521 and/or the flow parts are divided.
  • a fixed part 525, 526, 527 and a movable part 530, 531, 532 are provided.
  • the respective movable part is displaceable relative to the associated fixed part, in particular vertically displaceable in the direction z.
  • This can be done in different ways.
  • the movable part and the associated fixed part each comprise a thread, so that the movable part can be screwed into the fixed part.
  • a height adjustment of the movable parts in particular can be achieved Realize parts to each other. It is therefore possible to vary the sizes of the outlets 509 and 510. This allows the fluid flow to be adjusted and ultimately the cooling performance to be adjusted.
  • the Figure 22 shows an embodiment of the invention, in which three rings 110, 110 'and 110" as well as the cooling ring 107 are shown.
  • the rings are shown in top view.
  • the two rings 110' and 110" following the blown film 6 in the transport direction z have an eccentricity.
  • these rings are designed as ellipses.
  • the edges that will later be subjected to greater stress can be removed during production with a greater wall thickness than the other areas.
  • the major semi-axes of the ellipses are arranged parallel to one another.
  • the semi-major axis of one ring runs parallel to the semi-minor axis of another ring.
  • Other angles between the semimajor axes can also be advantageous.
  • FIG. 23 A further exemplary embodiment of the invention is now shown, which corresponds to the exemplary embodiment of Figure 15 resembles.
  • the cool box 12 is shown explicitly.
  • the rings 1510 correspond to those in the exemplary embodiment Figure 15 .
  • the rings 110 and 1510 are followed by a sealing air seal 2310, which is preferably also designed in the shape of a ring. It is preferred to arrange this sealing air seal below the cooling ring 107.
  • the barrier air seal is designed as a body in which at least the surface facing the blown film comprises at least partially porous, in particular microporous, material.
  • the porous material includes openings with a maximum size of 500 micrometers.
  • a material with such openings is usually sintered material, in particular sintered ceramic, sintered metal or sintered plastic.
  • a gas, in particular air can be supplied to the sealing air seal via a line 2320, which has an increased pressure compared to the ambient pressure. This pressure can in turn be generated with a fan or a compressor.
  • the embodiment according to Figure 24 shows an embodiment of the invention according to the embodiment Figure 9 resembles.
  • the suction port is replaced by a liquid reservoir 2410, to which a liquid and optionally also a gas can be supplied in order to achieve better cooling performance.
  • the liquid reservoir includes a supply line 2420 for the liquid and an optional supply line 2421 for the gas. Water is preferably used as the liquid, and air is preferably used as the gas.
  • the feed channels 911 are in comparison with the exemplary embodiment Figure 9 preferably unchanged and are provided above or below the liquid reservoir 2410.
  • the Figure 25 shows a further advantageous embodiment of the invention, with which the cooling performance can be increased further.
  • the flow divider is 2505 (see enlargement of the in the Figure 25 circled area) is interspersed with lines 2506, through which a tempered fluid can be passed, with which the flow divider 2505 can be tempered.
  • a tempered fluid for example, water, thermal oil or another liquid with a high heat capacity can be used as the fluid. It is particularly advantageous if the blown film is in contact with the flow divider in order to achieve the greatest possible heat transfer.
  • the flow divider 2505 can be divided into segments over the circumference of the blown film 6, in which case each segment can then preferably be individually tempered independently of other segments. In this way, the blown film can be influenced differently over the circumference, in particular with regard to the wall thickness of the blown film.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
EP17722745.1A 2016-05-09 2017-05-09 Blasfolienanlage zur herstellung einer blasfolie Active EP3455048B1 (de)

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DE102016207951 2016-05-09
DE102016208031 2016-05-10
PCT/EP2017/061024 WO2017194520A1 (de) 2016-05-09 2017-05-09 Blasfolienanlage zur herstellung einer blasfolie

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CN115891104B (zh) * 2022-11-08 2023-10-31 大伟机械设备(启东)有限公司 一种可调整膜厚的高速吹膜装置

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CN116175947A (zh) 2023-05-30
EP3455048A1 (de) 2019-03-20
CN109311210A (zh) 2019-02-05
CN109311210B (zh) 2022-12-30
US20190143573A1 (en) 2019-05-16
WO2017194520A1 (de) 2017-11-16

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